The Clip-On Cap Keeper from Sensei keeps your lens caps safe, clean and close at hand, helping to prevent their loss while shooting. The Clip-On Cap Keeper clips to a camera strap or backpack or camera bag strap and provides a spring clamp to hold your lens cap firmly in place. It works with any flat lens cap and easily opens and closes with one hand. It is a lightweight, unobtrusive and very practical way to keep lens caps handy and prevent their loss.